Chemistry Homework Help: Answers & Questions Page 82

• Chalcopyrite, the principal ore of copper (Cu), contains 34.63 percent Cu by mass. A particular sample of chalcopyrite contains 321.5g of copper. Determine the mass of the sample of chalcopyrite in units of grams ?

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• Why are atomic masses of most of the elements fractional?

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• What are the three geometric isomers of dibenzalacetone?

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• What is the formula and molar mass of beryllium chloride?

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• How many hydrogen atoms are in each formula unit of calcium bicarbonate ##Ca(HCO_3)_2##?

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• What is the formula for hydrochloric acid?

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• What is the oxidation state of the K atom in KClO4?

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• Write the correct chemical formula to distinguish between?: Hydrobromic acid and bromic acid

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• How are longitudinal waves and transverse waves similar?

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• Hybridization of ##"HCl"##?

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• Arrange the following atoms in order of increasing electronegativity: Si S O Na ?

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• What is the difference between an electrophile and a nucleophile?

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• How did Bohr change atomic theory?

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• How many grams of ##NaOH## must be used to make 1 Liter of a .80 M ##NaOH## solution?

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• How can I balance this chemical equations? Potassium metal and chlorine gas combine to form potassium chloride.

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• What is the difference between gravity filtration and vacuum filtration? When should vacuum filtration be used? What is the difference between copper (II) sulphate trihydrate, copper (II) sulphate pentahydrate, and anhydrous copper (II) sulphate?

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• Given an activation energy of 15 kcal/mol, how do you use the Arrhenius equation to estimate how much faster the reaction will occur if the temperature is increased from 100 degrees Celsius to 120 degrees Celsius? R = 1.987 cal/(mol)(k).

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• How do metalloids bond?

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• AgNO3 (3 is a subscript) + NaCl ---> NaNO3 (3is a subscript) + AgCl. If we use 15.0 grams of the first reactant and 15.0 grams of the second reactant, how many total grams of the definite product should we theoretically see at the end of the experiment?

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• Suppose a 375-mL sample of neon gas at 78°C is cooled to 22°C at constant pressure. What will the new volume be of the neon sample?

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• Is CO2 polar or nonpolar?

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• Please balance the following equation?? MnO4- + I- = MnO2 + IO3- (basic solution)

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• What is the difference between anti-aromatic and non aromatic compounds?

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• What is the difference between molecular formula and structural formula?

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• What is the molecular geometry of ##"H"_2"O"##? Draw its VSEPR structure.

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• How do isotopes affect the atomic mass of an element?

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• What is the chemical formula for iodine crystal?

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• What oxidation number is copper?

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• What is the name of ##LiI##?

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• How can I balance this chemical equation? Sodium phosphate and calcium chloride react to form calcium phosphate and sodium chloride

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• What is the balanced chemical equation that describes the dissociation of the strong base magnesium hydroxide, Mg(OH)2 in water?

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• What is an example of a chemical property of water?

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• What is the correct formula for the compound made by magnesium and nitrogen?

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• Why does ethanol only deflected slightly when a positively charged rod is placed next to a stream of it?

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• What functional group is in ethyl butyrate?

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• What is the symbol for phosphorus, the group and the number of valence electrons also the period too? thanks love you all

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• How many molecules are present in a drop of ethanol, C2H5OH, of mass 2.3 × 10–3 g? (L = 6.0 × 1023 mol–1)

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• What is the name of the compound ##CO##?

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• How would you arrange the following compounds in order of decreasing pka: ClCH2CH2OH, CH3CH2OH, and Cl2CHCH2OH?

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• How would you describe the structure ot an atom?

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• How do the specific heats of metals compare with water?

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• How many atoms are present in 48.60 g of Mg?

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• What does S configuration mean?

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• Why water is considered as pure substance whereas air is considered as impure substance?

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• What hydrogen bonds join cytosine to guanine?

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• HCN toxixity is:? 1- change osmotic pressure inside the cell 2- disturbance of acid-base equilbrium in body 3- covalent bonding to heme ion

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• The density of gold is ##19.3 g####/####cm^3##. What is the volume, in ##cm^3##, of a sample of gold with mass ##0.715## ##kg##? If this sample of gold is a cube, how long is each edge in ##cm##?

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• How does a polar covalent bond differ from an nonpolar?

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• Why are Van der Waals interactions important to the tertiary structure of proteins?

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• What is the valence electron configuration for carbon?

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